Malicious PDF — malware analysis report

Static analysis result for SHA-256 a465aacf09aa5b3f…

MALICIOUS

PDF

135.3 KB Created: 2021-06-29 07:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 162f5fface0f3cc80493438a52d2eff9 SHA-1: 8b9046fd27605b55d57c7bee18087a5b707b4889 SHA-256: a465aacf09aa5b3f3068422fc9158abc250dff5299e5258cd61c38b0a4eb25f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, with numerous embedded URLs. The document body was unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/43716191232.pdf In PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/39453f52bb131142ed99e12a24e09aa7/11096739055.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/11545420121.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/fabotuwin.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/vebod.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xeroviwakexap.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vl9k3v2udtcp48l9lf77btj846/90029000898.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/97954266456.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/fufudipebug.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a73eaa3e3f8954f36256b40829f7b474/nebunuteterabidurekijixe.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/caa26dbcab09c974b1f275cee87de50e/52031427318.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/88335c87bd03a20de966225cbca9dbc5/92713584915.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d8li4vpvml539dq8rpq1ga22j7/kotuzenamejipidavokinek.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/62f0250fb115475ecc95f2b52ba1dff5/54891722007.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ed814b54---vitizagunugob.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/25033006495.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/24152903557.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bdc3e9e66116affcae4c09e5fd9bb19e/1819572261.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/lokefegaxejirikoxulifag.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/57117496931.pdfIn PDF document text
    • http://alkanboya.com/files/file///62479827111.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/c619d5def402419ebcbb4cbf10c25b8e/gabesemululixenorim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dr+who+chronological+episode+guidePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ac94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC94 18768 bytes
SHA-256: 7f5a07bfa32e312caf8a0d9fa5b3c4eb42b291e1c50a67fa38607205497b0b0d
font_01_sfnt_off0001de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE5D 10884 bytes
SHA-256: 491f3b17107b6575df1fc3c9f5200862be1404be6ff17b95f59d6b2c83be4324
font_02_sfnt_off0001f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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